Search results for " sulfur"
showing 10 items of 56 documents
Riscoperta di alcuni ipogei artificiali nel Comune di Sutera (Caltanissetta, Sicilia centrale)
2020
Grazie ad approfondite ricerche di archivio e accurate indagini speleologiche, sono stati ispezionati e documentati diversi ipogei artificiali presenti nel comprensorio di Sutera (CL). L’area di Sutera, caratterizzata da affioramenti evaporitici messiniani e non lontana da importanti miniere di salgemma e di zolfo, ha subito una veloce corsa verso la ricerca di minerali pregiati intorno ai primi del ‘900. A memoria di queste attività sono rimaste diverse tipologie di cavità, quali: gallerie di carreggio, discenderie per ricerca mineraria, ma anche antiche cisterne per la raccolta d’acqua dove recentemente, a seguito di operazioni di ripristino e pulizia, sono stati effettuati importanti rit…
Un lessico settoriale estinto: la lingua solfaresca nelle scritture
2019
Le voci di questo lessico di fine Ottocento, ormai spento negli usi concreti e persino dei ricordi degli ultimi zolfarai, è rinvenibile – relativamente ai testi scritti – nelle raccolte folkloriche di canti di miniera, nelle testimonianze diaristiche di tre donne straniere (Chapman, Hamilton-Caico; White Mario), in testi socio-economici, nei registri e verbali tecnici, in qualche testo letterario (Pier Maria Rosso di San Secondo, Luigi Pirandello, Alessio Di Giovanni, Giuseppe Giusti Sinopoli, Andrea Camilleri, Angelo Petix). Nell'articolo ci si concentra sul trattamento fonetico e morfologico di alcune voci, a partire dalle diverse tipologie di testo. In particolare sulle voci carusu (tras…
Interaction of Gold with Co-Condensed and Grafted HMS-SH Silica: A 29Si {1H} CP-MAS NMR Spectroscopy, XRD, XPS and Au LIII EXAFS Study
2010
Hexagonal mesoporous silica (HMS) is functionalised with mercaptopropyl groups by adopting two different procedures ; co-condensation and grafting. In both cases tetraethylorthosilicate (TEOS) and 3-mercaptopropyltriethoxysilane (3-MPTES) are used as the silicon and sulfur precursors, respectively. The obtained materials are analysed by several techniques such as N 2 sorption, TG-DTA, XRD, SAXS and-solid state 29 Si { 1 H} CP-MAS NMR spectroscopy. By taking advantage of the chemical interaction between gold and the -SH groups, the effect of the thiol addition procedure on the supporting capability of the functionalised silica is evaluated by depositing gold through the incipient wet impregn…
CCDC 915602: Experimental Crystal Structure Determination
2013
Related Article: Michael Giese, Markus Albrecht, Arto Valkonen, Kari Rissanen|2013|Eur.J.Org.Chem.|2013|3247|doi:10.1002/ejoc.201201704
CCDC 929061: Experimental Crystal Structure Determination
2013
Related Article: Zulema Arcís-Castillo, Francisco J. Muñoz-Lara, M. Carmen Muñoz, Daniel Aravena, Ana B. Gaspar, Juan F. Sánchez-Royo, Eliseo Ruiz, Masaaki Ohba, Ryotaro Matsuda, Susumu Kitagawa, and José A. Real|2013|Inorg.Chem.|52|12777|doi:10.1021/ic4020477
Multiscale Investigation of the Structural, Electrical and Photoluminescence Properties of MoS2 Obtained by MoO3 Sulfurization
2022
In this paper, we report a multiscale investigation of the compositional, morphological, structural, electrical, and optical emission properties of 2H-MoS2 obtained by sulfurization at 800 °C of very thin MoO3 films (with thickness ranging from ~2.8 nm to ~4.2 nm) on a SiO2/Si substrate. XPS analyses confirmed that the sulfurization was very effective in the reduction of the oxide to MoS2, with only a small percentage of residual MoO3 present in the final film. High-resolution TEM/STEM analyses revealed the formation of few (i.e., 2–3 layers) of MoS2 nearly aligned with the SiO2 surface in the case of the thinnest (~2.8 nm) MoO3 film, whereas multilayers of MoS2 partially standing up with r…
Deformation of sulfur hexafluoride and floppiness of trifluoromethyl sulfur pentafluoride
2006
International audience; With recent advances in space exploration and atmospheric chemistry there is an increased need for more spectroscopic tools to allow the of study complex species. One such tool is the theory of frame transformation of coupled rotor systems. In this article, the theory of frame transformation along with the concept of rotational energy surface is used to study the symmetry that occurs in trifluoromethyl sulfur pentafluoride due to the internal rotation of the CF3 radical and, more generally, to the extent of floppiness of SF5CF3. Other lower symmetries when a CF4 molecule is stuck on the various symmetry axes of an SF6 molecule are also discussed.
Sensitivity to allyl isothiocyanate, dimethyl trisulfide, sinigrin, and cooked cauliflower consuption
2006
International audience; The consumption of cauliflower consumers has been related to the olfactory and gustatory sensitivities to potentially objectionable flavor compounds in this vegetable. Based on the ascending concentration series method of limits, a first experiment was designed to develop rapid tests dedicated to estimate individuals' olfactory thresholds for allyl isothiocyanate (AITC) and dimethyl trisulfide (DMTS) and gustatory thresholds for sinigrin (SIN). The best compromise between rapidity and reliability was obtained with two replications of a four-alternative forced choice (AFC) at six ascending concentrations (6×2×4-AFC) for both AITC and DMTS, and with a 6×1×4-AFC for SIN…
Stability and extraction of bioactive sulfur compounds from Allium genus processed by traditional and innovative technologies
2017
Abstract Since ancient times, species from the Allium genus have been used in both culinary and medicinal applications. The health promoting properties, with well documented “evidence-based” studies, were attributed to the genus’ high content of bioactive organosulfur compounds. For these reasons, the organosulfur compounds have attracted interest in both food and pharmaceutical industries to be used as additives or supplements. Therefore, improvement in the extraction and stability during processing and storage of these molecules is crucial. The presented review documents the effects of traditional and innovative processing techniques on the extraction and stability of organosulfur compoun…
Excitation Energy Transfer in Isolated Chlorosomes from Chlorobaculum tepidum and Prosthecochloris aestuarii
2012
Excitation energy transfer in chlorosomes from photosynthetic green sulfur bacteria, Chlorobaculum (Cba.) tepidum and Prosthecochloris (Pst.) aestuarii, have been studied at room temperature by time-resolved femtosecond transient absorption spectroscopy. Bleach rise times from 117 to 270 fs resolved for both chlorosomes reflect extremely efficient intrachlorosomal energy transfer. Bleach relaxation times, from 1 to 3 ps and 25 to 35 ps, probed at 758 nm were tentatively assigned to intrachlorosomal energy transfer based on amplitude changes of the global fits and model calculations. The anisotropy decay constant of about 1 ps resolved at 807 nm probe wavelength for the chlorosomes from Chlo…